{"id":"bc7d066e-e84d-43cd-b5d9-4068f0241018","shortId":"mKZkEg","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/31` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are priced uniformly at $0.02 per call.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The actual functionality behind the `/api/v1/transactions/31` endpoint is unclear; the description \"Premium API Access\" is generic and does not specify what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema definition available for any endpoint","The specific endpoint /api/v1/transactions/31 has a generic 'Premium API Access' description — its actual functionality is unknown","No request or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/31","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of the specific /api/v1/transactions/31 endpoint is unclear beyond the generic label 'Premium API Access'. Pricing is clear ($0.02/request in USDC on 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'machin':129 'metric':123 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'openapi':187 'page':172 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'per':3,18,60,160 'platform':6,21,38,115 'premium':88,211 'price':139,156,169 'prompt':179 'quot':144 'rate':74,142 'readm':171 'render':174 'report':124 'request':61,96 'request/response':190 'requir':79 'return':92,225 'schema':188 'sentiment':131 'sentiment-analysis' 'servic':55,223 'set':43 'sinc':107 'spars':165 'specif':81 'specifi':219 'summar':134 'text':133 'text-summarization' 'token':143 'unclear':208 'uniform':157 'unit':102 'usdc':15,30,64,104,108 'usdc api' 'usdc-base-network' 'use':109 'util':54,149 'utility-services' 'valid':151 'via':10,25 'wallet':178 'web3':138 'x402':11,26,35,94 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ac20b382-8579-4606-a72c-09d2dd59b773","listingId":"bc7d066e-e84d-43cd-b5d9-4068f0241018","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/transactions/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:55.562Z"}],"sources":[{"listingId":"bc7d066e-e84d-43cd-b5d9-4068f0241018","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:55.562Z","lastSeenAt":"2026-04-22T12:04:37.769Z"}],"details":{"listingId":"bc7d066e-e84d-43cd-b5d9-4068f0241018","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/31 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/31"},{"claim":"Platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports on a per-request payment basis","Using utility services like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or sandbox environments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.381Z"},"updatedAt":"2026-04-22T12:04:37.769Z"}}